All but one of the following techniques were mentioned as methods of reducing observer bias. Which is it?
A) using scientific instruments
B) simplifying the observers' task
C) making observers blind
D) using multiple observers

Question

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The Answer of All but one of the following techniques were mentioned as methods of reducing observer bias. Which is it?
A) using scientific instruments
B) simplifying the observers' task
C) making observers blind
D) using multiple observers

All but One of the Following Techniques Were Mentioned as Methods